Cytosorbents

CTSO · NASDAQ

$5.32+$0.36 (+7.26%)TodayMarket closed · Oct 20, 7:47 PM ET

Prev close $4.96

Who owns CTSO

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 34.7% of CTSO’s shares.

Avenir Corporation8.3%
Rokk LLC7.3%
Satterfield (Thomas A Jr)4.6%
Neuberger Berman, LLC3.1%
Next 6 largest institutions11.5%
All other shareholders65.3%

Top institutional holders of CTSO
Holder	Shares	% of shares	Change, last filing	Filed
Avenir Corporation	5.19M	8.26%	−26.56K	Jun 30, 2026
Rokk LLC	4.58M	7.29%	+0	Jun 1, 2026
Satterfield (Thomas A Jr)	2.89M	4.59%	+2.89M	Jan 13, 2025
Neuberger Berman, LLC	1.97M	3.13%	+285.68K	Jun 30, 2026
Vanguard Capital Management, LLC	1.91M	3.05%	+34.07K	Jun 30, 2026
CM Management, LLC	1.48M	2.35%	+0	Jun 30, 2026
Chan (Phillip P)	1.37M	2.19%	+338.47K	Jun 15, 2026
Skylands Capital, LLC	1.21M	1.93%	−496.10K	Jun 30, 2026
BlackRock Institutional Trust Company, N.A.	627.21K	1.00%	−144.52K	Jun 30, 2026
Geode Capital Management, L.L.C.	602.06K	0.96%	−105.20K	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of CTSO
Holder	Shares	% of shares	Change, last filing	Filed
Vanguard Total Stock Market Index Fund	63.72K	0.10%	+0	Jul 31, 2026
Neuberger Intrinsic Value Fund	32.33K	0.05%	+0	Jul 31, 2026
Vanguard Extended Market Index Fund	28.72K	0.05%	+0	Jul 31, 2026
Fidelity Extended Market Index Fund	14.61K	0.02%	−28	Jul 31, 2026
Fidelity Total Market Index Fund	4.72K	0.01%	+0	Jul 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Over the last 6 months, insiders bought $269.33K (10 trades) of CTSO on the open market, with no sales.

Latest CTSO insider transactions
Insider	Date	Type	Shares	Price	Value
Chan Phillip P.	Sep 15, 2026	Buy	3.77K	$6.00	$22.64K
Sobel Alan D.	Sep 15, 2026	Buy	100	$6.01	$601
Sobel Alan D.	Sep 15, 2026	Buy	500	$6.05	$3.03K
Sobel Alan D.	Sep 15, 2026	Buy	1.90K	$6.12	$11.63K
Capponi Vincent	Sep 14, 2026	Buy	273	$5.90	$1.61K
Capponi Vincent	Sep 14, 2026	Buy	1.80K	$6.07	$10.93K
Chan Phillip P.	Sep 4, 2026	Buy	200.00K	$0.35	$70.00K
MARIANI PETER J	Jun 15, 2026	Buy	100.00K	$0.44	$44.00K
Chan Phillip P.	Jun 15, 2026	Buy	10.33K	$0.43	$4.44K
Chan Phillip P.	Jun 12, 2026	Buy	251.14K	$0.40	$100.45K

Short interest

Settled Sep 30, 2026

Shares short: 123.89K
Days to cover: 11.98
% of shares outstanding: 0.20%
Average daily volume: 10.34K
Change since last report: +2.7%

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